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    <title>Document</title>
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<body>
  
   <script>  
    // 转换为时分秒就是剩余的时间(当前时间戳->毫秒数)
    // let date = new Date()

    // 1.getTime()
    // console.log(date.getTime());

    // 2. +new Date()
    // console.log(+new Date());

    // 3.Date.now()
    console.log(Date.now());

    console.log(+new Date("2023-9-1 12:00:00"));//未来时间戳
    </script>
</body>
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